Compléter les cases vides ci-dessous.
Puis valider

Compléter :
(a+b)² =
(a-b)² =
(2a+b)² = [?]
(a-3b)² =
(5a-2b)² =

Compléter et ordonner :
(x-7)² =
(2x+3)² =
(5x-1)² =
(4x-7)² =
(-x+5)² = [?]
(-x-7)² = [?]
(-2x+9)² =
(-3x-3)² =
(6x-1)² =
(3x+7)² =